I didn't use the 1.19.1 XFE presented here. Instead, I used the one from Ubuntu installed from the PPM, which is now at v-1.32.2 I believe? At the moment I can't recall whether or not it showed up in the PPM window, or if I had to do a search for it - but I do seem to remember installing directly from BarryK's PPM and it working fine with LuPu regardless of the version.

The one problem I did have with XFE could be traced back to a bug itself with the FOX engine, and that was that the "Clearlooks Theme" they've encoded into XFE's FOX engine doesn't work to "round off the sharp edges". Yet that's solely a bug in looks and doesn't affect the performance.